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Derivatives and Hedge Accounting Activities (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | $ 297 |  | $ 307 |
Derivative Liabilities |  | 145 |  | 284 |
Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 170 | [1] | 166 |
Derivative Liabilities |  | 8 |  | 66 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 40 |  | 32 |
Derivative Liabilities |  | 13 |  | 8 |
Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 152 | [2] | 169 | [3]
Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 88 |  | 75 |
Current Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 94 |  | 163 |
Current Assets | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 60 |  | 75 |
Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 58 |  | 6 |
Current Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 28 |  |  |
Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 145 |  | 138 |
Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 82 |  | 91 | [1]
Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 40 |  | 32 |
Noncurrent Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 54 |  | 95 |
Noncurrent Assets | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 45 |  | 91 |
Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 59 |  | 11 |
Noncurrent Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 37 |  |  |
Noncurrent Assets | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 8 |  |  |
Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 32 |  | 32 |
Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 32 |  | 32 |
Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 109 | [6] | 250 | [7]
Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 8 |  | 53 |
Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 13 |  | 8 |
Current Liabilities | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 96 |  | 195 |
Current Liabilities | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 8 |  | 9 |
Current Liabilities | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  | 6 |
Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 10 |  | 53 |
Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 44 |
Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  |  |
Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 2 |
Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 2 |
Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 36 |  | 34 |
Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [10] |  |  | 13 |
Noncurrent Liabilities [Member] | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 4 |  | 2 |
Noncurrent Liabilities [Member] | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 32 |  | 32 |
Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 13 |
Fair Value - Derivatives under Hedge Accounting [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 160 |  | 54 |
Derivative Liabilities |  | 112 |  | 191 |
Fair Value - Derivatives under Hedge Accounting [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [1] | 65 |  |  |
Derivative Liabilities |  |  |  | 57 |
Fair Value - Derivatives under Hedge Accounting [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 40 |  | 32 |
Derivative Liabilities |  | 13 |  | 8 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 66 | [2] | 11 | [3]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 28 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 8 |  | 5 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 58 |  | 6 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 28 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 94 |  | 43 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 37 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [5] | 40 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 3 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 59 |  | 11 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 37 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 8 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 32 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Assets | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 32 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 77 | [6] | 158 | [7]
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] |  |  | 44 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [8] | 13 |  | 8 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 64 |  | 103 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Commodity contracts | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 9 |  | 6 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 10 |  | 53 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 44 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Interest rate | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 1 |  |  |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 2 |
Fair Value - Derivatives under Hedge Accounting [Member] | Current Liabilities | Foreign currency | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 2 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 35 |  | 33 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [10] |  |  | 13 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 3 |  | 1 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 32 |  | 32 |
Fair Value - Derivatives under Hedge Accounting [Member] | Noncurrent Liabilities [Member] | Interest rate | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  |  |  | 13 |
Fair Value - Derivatives not under Hedge Accounting |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 137 |  | 253 |
Derivative Liabilities |  | 33 |  | 93 |
Fair Value - Derivatives not under Hedge Accounting | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 105 | [1] | 166 |
Derivative Liabilities |  | 8 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 86 | [2] | 158 | [3]
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [3] | 60 |  | 75 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 86 |  | 158 |
Fair Value - Derivatives not under Hedge Accounting | Current Assets | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 60 |  | 75 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset | [4] | 51 |  | 95 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 45 |  | 91 | [1]
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 51 |  | 95 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Assets | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Asset |  | 45 |  | 91 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 32 | [6] | 92 | [7]
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [7] | 8 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 32 |  | 92 |
Fair Value - Derivatives not under Hedge Accounting | Current Liabilities | Commodity contracts | Virginia Electric and Power Company |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | 8 |  | 9 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities | [9] | 1 |  | 1 |
Fair Value - Derivatives not under Hedge Accounting | Noncurrent Liabilities [Member] | Commodity contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Derivative Liabilities |  | $ 1 |  | $ 1 |
[1] | Noncurrent derivative assets are presented in other deferred charges and other assets in Virginia Power’s Consolidated Balance Sheets.
[2] | Current derivative assets are presented in other current assets in Dominion Energy’s Consolidated Balance Sheets.
[3] | Current derivative assets are presented in other current assets in Virginia Power’s Consolidated Balance Sheets.
[4] | Noncurrent derivative assets are presented in other deferred charges and other assets in Dominion Energy’s Consolidated Balance Sheets.
[5] | Noncurrent derivatives assets are presented in other deferred charges and other assets in Dominion Energy Gas’ Consolidated Balance Sheets.
[6] | Current derivative liabilities are presented in other current liabilities in Dominion Energy’s Consolidated Balance Sheets.
[7] | Current derivative liabilities are presented in other current liabilities in Virginia Power’s Consolidated Balance Sheets.
[8] | Current derivative liabilities are presented in other current liabilities in Dominion Energy Gas’ Consolidated Balance Sheets.
[9] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Dominion Energy’s Consolidated Balance Sheets.
[10] | Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in Virginia Power’s Consolidated Balance Sheets.

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